Conversion to a String object is performed by invoking the toString() method of that object. : Arithmatic Operators « Operators « SCJP

1. SCJP
2. Operators
3. Arithmatic Operators

public class MainClass{
    public static void main(String[] argv){

       String a = "a";
       MyClass b = new MyClass();

       String c = a + b;
       System.out.println(c);

    }
}
    
class MyClass{
   public String toString(){
      return "my class";
   }

}

amy class